Ectopic pregnancy can be detected by gynecologic ultrasound at 6-8 weeks of menopause. The diagnosis of ectopic pregnancy depends mainly on the results of gynecologic ultrasound. Ectopic pregnancy is manifested on gynecologic ultrasound by the absence of a definite gestational sac in the uterus and the presence of a mixed echogenic mass in the adnexa or horn of the uterus, in which the yolk sac, embryo or fetal heart may be seen. In women with regular menstrual cycles, the location of the gestational sac can be confirmed by transvaginal gynecologic ultrasound as early as 5 weeks of pregnancy. At this time, only an echogenic or cystic echo can be seen in the uterus, and no yolk sac, embryo or fetal heart can be seen in the uterus. The possibility of ectopic pregnancy is completely ruled out when an intrauterine sac with a yolk sac, a fetal bud or a fetal heart can be detected by transabdominal gynecologic ultrasound at 6-8 weeks of gestation. If an intrauterine gestational sac cannot be seen at the corresponding gestational week, you should be alert for ectopic pregnancy. After pregnancy is confirmed, blood HCG levels and gynecological ultrasound should be monitored regularly to rule out the risk of ectopic pregnancy as soon as possible.